I understand the frustration! I found out I was pregnant on oct 1st and knew we conceived around the 15th of September, I go to my ultrasound, thinking I am almost 10 weeks(going by last period) and the ultrasound says I am only 6 weeks and one day!! I found out 6 weeks ago and my duedate changed from June 9 th to July 14 th!!! They said I conceived October 5 th or later!!! But I knew on the 1st!! I am going back to the doctor Monday but she said I could have had a misscariage and gotten pregnant again without knowing!! I did not know that could happen and I am very frustrated, I hope everything goes ok for us both!! Very confusing.

use the "count-back" method. It says to add 7 days to the first day of your last menstrual period and then subtract 3 months or add 40 weeks from the first day of your last menstrual period. hope that helps :)

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